Toxoplasma gondii Tissue Cyst (IMAGE) University of Chicago Medical Center Caption This is a scanning electron micrograph of the protozoan parasite Toxoplasma gondii, tissue cyst in brain of an infected mouse. Credit David Ferguson Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.